Looks like Apple Computer’s advertising department and music service need to get in tune.

The latest commercials for the iPod digital-music player feature the song “Channel Surfing,” by a DJ named Feature Cast. They are arresting spots, with black silhouettes of dancers with white iPods against vibrant fuchsia backgrounds. The song is upbeat and catchy.

There’s only one problem: As of yesterday, “Channel Surfing” wasn’t available on Apple’s music store, iTunes.

“It’s a little ironic that they chose to put that song in the commercial,” said Michael Gartenberg, an analyst with Jupiter Research. “There’s probably someone in the publicity department who is a little red-faced.”

Apple officials did not return calls seeking comment.

The use of “Channel Surfing” highlights one of the problems the Recording Industry Association of America has in trying to woo users off of music-swapping services such as Kazaa: Legitimate music stores don’t have everything today’s music fans want.

“Part of the Napster phenomenon was that it was free,” Gartenberg said. “But the other side of the coin is that it was every song ever recorded in digital format.

“The question is whether iTunes has crossed the threshold to be good enough for most users, and the answer is yes,” Gartenberg added. “Eventually it will have everything.”